How to wait for animation completion (C#)?

Hello UA, I am making a very simple script to animate a door opening and closing on proximity by pressing e. What happens though, is I can spam e and the animations don't finish. How can I make the script wait before you can press e to start the animation until the other animation finishes? I am still new to Unity, so try to explain why you do certain things vs others. FYI, the door is on the back of a ship and flips down. Finally, ask for clarification if needed. CODE:

 using UnityEngine;
 using System.Collections;
 
 public class OpenShipDoor : MonoBehaviour {
         
     bool doorup = false;
 
     void OnTriggerStay(Collider other){
 
         if (Input.GetKeyDown ("e"))
         {
             if (doorup == false)
             {
                 doorup = true;
                 animation.Play("doorup1");
 
             }
             else
             {
                 doorup = false;
                 animation.Play("doordown1");
             
 
             }
         }
     }
 }